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Princess Charlotte of Cambridge, 3, is a star who has her royal wave down to an art. And she's a veteran of bridesmaid duties, serving for the third time in 18 months at a family wedding, this one for cousin Princess Eugenie of York when she married Jack Brooksbank in St. George's Chapel at Windsor Castle on Oct. 12, 2018. Andrew Matthews/WPA Pool/Getty Images

Here's the sweet shot of Princess Charlotte with brother Prince George as they arrived for the wedding and stood on the steps of St. George's Chapel waiting for bride Princess Eugenie of York. Steve Parsons/AP

Princess Charlotte was a vision in blue-and-white, in one of her signature smock dresses plus blue shoes and a blue bow in her hair, for the christening of her baby brother, Prince Louis, at the Chapel Royal, St James's Palace in London, July 9, 2018. Dominic Lipinski/Pool/AP

Princess Charlotte and Prince George played on the grass with mum Duchess Kate of Cambridge while daddy Prince William played in the Maserati Royal Charity Polo match on June 10, 2018 in Gloucester, England. Karwai Tang/ WireImage

At age 3, Princess Charlotte is getting to be an old hand at royal ritual. She joined the entire royal family on the Buckingham Palace balcony for the annual Trooping the Colour parade on June 9, 2018, standing in this picture with her parents, grandfather Prince Charles, great-grandmother Queen Elizabeth II, uncle Prince Harry and his bride, Duchess Meghan, and her young cousin, Savannah Phillips. Chris Jackson/ Getty Images

Duchess Kate leans in to talk to Princess Charlotte and her young cousin, Savannah Phillips, as they await the flypast on the balcony of Buckingham Palace after the Trooping the Colour parade on June 9, 2018. EPA-EFE

Princess Charlotte delighted photographers by sticking out her tongue on her way to the wedding of uncle Prince Harry and the former Meghan Markle at Windsor Castle on May 19, 2018. Prince Harry had done the same to photographers when he was a mischievous little boy 30 years earlier. Andrew Milligan/ AP

Princess Charlotte stands with her mother, Duchess Kate, wearing her bridesmaid dress by Givenchy, the same house that designed the former Meghan Markle's gown for her wedding to Prince Harry, on May 19, 2018. ANDREW MATTHEWS/ AFP/Getty Images

Princess Charlotte bestows a kiss on new baby brother Prince Louis of Cambridge in photo taken by their mother, Duchess Kate of Cambridge, at Kensington Palace, four days after his April 23, 2018, birth. The picture was released to honor Charlotte's 3rd birthday on May 2. Duchess of Cambridge, Kensington Palace, EPA-EFE

Princess Charlotte is a star! The second child of Prince William and Duchess Kate of Cambridge turns 3 on May 2, just 10 days after she went with dad and brother Prince George, 4, to visit mum and new baby brother Prince Louis at the hospital in London where he was born, April 23, 2018. She couldn't resist a jaunty wave to the crowd of media people and well-wishers. Chris Jackson, Getty Images

Prince George looked a little nonplussed at the media mob but Princess Charlotte waved as the two royal children accompanied Prince William to St. Mary's Hospital to see Duchess Kate and their new brother, Prince Louis. Chris Jackson, Getty Images

The watching crowd of well-wishers cheered as the children entered St. Mary's Hospital while the media camera's clicked and whirred. George was dressed in his school uniform and Charlotte was in one of her signature floral-patterned dresses and cardigans. ANDY RAIN, EPA-EFE

Princess Charlotte smiles as she prepares for her first day of school at the Willcocks Nursery School in London, Jan. 8, 2018. She poses on the steps at Kensington Palace in a picture taken by her mother, Duchess Kate of Cambridge. The Duchess of Cambridge via AP

Princess Charlotte strikes a pose on the steps of Kensington Palace on her first day of school at the Willcocks Nursery School, in London, in a picture taken by her mother, Duchess Kate of Cambridge. The Duchess of Cambridge, AP

Duchess Kate and Princess Charlotte explore a helicopter before departing from Hamburg airport on the last day of the royal tour of Poland and Germany on July 21, 2017 in Hamburg, Germany. Chris Jackson, Getty Images

Duchess Kate held daughter Princess Charlotte when they arrived in Warsaw, Poland, on July 17, 2017, for the frist day of the Cambridge royal tour of Poland and German. Samir Hussein, Samir Hussein/WireImage

Princess Charlotte might be thinking: So THIS is the Trooping the Colour parade I've heard so much about. The 2-year-old princess was on the Buckingham Palace balcony with her mother, Duchess Kate, and the rest of the royal family for the annual parade celebrating her great-grandmother Queen Elizabeth II's official birthday, June 17, 2017 in London. Chris Jackson, Getty Images

Princess Charlotte and Prince George peek out a window of Buckingham Palace before joining their royal relations on the balcony to watch the Trooping the Colour parade celebrating great-grandmother Queen Elizabeth II's official birthday, in London on June 17, 2017. FACUNDO ARRIZABALAGA, EPA

Princess Charlotte of Cambridge, who just turned 2, made her debut as a royal bridesmaid at her aunt Pippa Middleton's wedding on May 20, 2017, in Englefield, Engand. Her mother, Duchess Kate of Cambridge, spoke to her after the service, where Charlotte was one of the bridesmaids. WPA Pool, Getty Images

Princess Charlotte wore flowers in her hair and an ivory silk dress with a frilly collar and a huge pink-nude bow in the back for her aunt Pippa Middleton's wedding. She carried a basket as she stopped with her mother in front of St Mark's Church in Englefield, England. Samir Hussein/WireImage

Princess Charlotte with her brother Prince George, a pageboy at Aunt Pippa Middleton's wedding, pose with their mother after the ceremony at St. Mark's Church in Englefield, England. Their bridesmaid and pageboy outfits were made by Spanish brand Pepa & Co. Samir Hussein, Samir Hussein/WireImage

Pippa Middleton and her new husband, James Matthew, her sister, Duchess Kate of Cambridge, and their retinue of pageboys and bridesmaids, including Prince George and Princess Charlotte, pose at St Mark's Church in Englefield, on May 20, 2017. JUSTIN TALLIS, AFP/Getty Images

Princess Charlotte, clutching a candy cane, pauses at door of St. Mary's Church in Englefield, where she accompanied her parents and brother Prince George to Christmas Day services, nearby to the Middleton family estate in Bucklebury, England. ANDREW MATTHEWS, AFP/Getty Images

Princess Charlotte smiles as she and her family prepare to leave Victoria Harbour in to board a sea-plane on the final day of their royal tour of western Canada, on Oct.1, 2016 in Victoria, Canada. Stephen Lock, Getty Images

Charlotte delighted in the balloons at the children's party she and Prince George and her parents attended in Victoria on Sept. 29, 2016 during the family's royal tour of western Canada. Pool/Sam Hussein, WireImage

In her mother's arms, Charlotte looked a little nonplussed at all the fuss when she arrived with her family in Victoria to start the Cambridge royal tour of western Canada on Sept. 24, 2016. Samir Hussein, WireImage

Princess Charlotte made her first appearance on the Buckingham Palace balcony for the special Trooping the Colour of 2016, honoring her great-grandmother's 90th birthday, on June 11, 2016. Ben A. Pruchnie, Getty Images

Happy birthday, Charlotte. Duchess Kate took pictures of her daughter to mark her 1st birthday, May 2, 2016. The pictures were taken at the Cambridge country home Anmer Hall in Norfolk. HRH THE DUCHESS OF CAMBRIDGE/HANDOUT, EPA

What happened to your shoe, Charlotte? For the Cambridge Christmas 2015 card, Kensington Palace released this picture Dec. 18, showing the Duke and Duchess of Cambridge with their children, Prince George and Princess Charlotte (with shoe fallen off) in late October at Kensington Palace in London. EPA

Prepare for a cuteness overload: Princess Charlotte Elizabeth Diana of Cambridge strikes a pose at her home, Anmer Hall at Sandringham, in a picture taken by her mum, Duchess Kate of Cambridge, and released on Nov. 29, 2015, a little over six months after her birth. Gone is the anonymity of infancy; she looks like a real person now, and sweet to boot. AP

Pictures of Charlotte are few and far between, so even her newborn pictures are prized, even though newsborns mostly look alike, especially if they're covered in blankets and baby caps. These, by the way, were hand-made in Spain and were a gift from the Cambridge nanny, Maria Teresa Turrion Borrallo. Charlotte was born on May 2, 2015 at St Mary's Hospital in London, and went home with her parents only hours later. EPA

Prince William is an old hand now at toting babies, having learned the ropes with Prince George two years before. Charlotte's name was announced two days after her birth, on May 4. She's the fourth-in-line to the British throne. EPA

The next time we got to see Charlotte was especially touching, in a double portrait with Prince George snapped by Kate at Anmer Hall in mid-May a few weeks after her birth, and released on June 6, June 2015. EPA

The next sighting of Charlotte was at her christening at the Sandringham church, on July 5, wearing the royal christening gown as George and scores of royal babies have done since the mid-19th century. Charlotte was mostly hidden in her fancy baby carriage but Kate took her out to carry her into the church for the ceremony. EPA

Everyone wants to see Princess Charlotte, especially Prince George, at her christening. But it may be months more before we see the youngest royal again, so these remarkably skillful 'mum snaps' by Duchess Kate will have to do for now. AFP/Getty Images

Princess Charlotte and her older brother Prince George, 5, attended Princess Eugenie's wedding along with more cute kids, including their second cousins and the great-great nephew of fashion designer Hubert de Givenchy. The wore outfits designed by Amaia Arrieta of Amaia Kids.

Eugenie, who is ninth in line for the throne, was a radiant bride. While she nixed a veil, she did opt to wear a tiara, the glitzy Greville Emerald Kokoshnik tiara, specifically. WPA Pool, Getty Images

The gown, for which Eugenie worked closely with the label's co-founders, Peter Pilotto and Christopher De Vos, featured a low back at Eugenie's request. This allowed her scar from a childhood surgery to correct scoliosis to be on display. NEIL HALL, EPA-EFE